MICROSTRUCTURAL PROPERTIES AND PHASE CONSTITUENTS OF 5A06 ALUMINIUM MATRIX SURFACE COMPOSITE FABRICATED BY FRICTION STIR PROCESSING

Liu Peng (), Qing-Yu Shi, Yuan-Bin Zhang and Shu-Bo Xu
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Liu Peng: School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, P. R. China;
Qing-Yu Shi: Key Laboratory for Advanced Materials, Processing Technology Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P. R. China
Yuan-Bin Zhang: School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, P. R. China
Shu-Bo Xu: School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, P. R. China

Surface Review and Letters (SRL), 2011, vol. 18, issue 05, 183-188

Abstract: A novel aluminium matrix surface composite addedAl-based amorphous, whose layer depth was 5 mm, was fabricated by friction stir processing (FSP), at an air cooling. The surface composite region shows the obvious sandwich structure. It is considered to be a combination between the base metal and the amorphous strip via the FSP. The average hardness of the surface composite is about HV97, higher than the base metal is about HV80. The maximum tensile strength of the processed aluminium plate with the surface composite is 410 MPa. XRD results indicate that the constituent phases of the surface composite mainly includeα-Al,Mg2Al3,MnAl6andLa3Al11Moreover, no obvious amorphous diffraction peaks are observed in the XRD results. However, a large number of ultrafine grained structures can be observed in the surface composite. The average grain size of them is ~90–400 nm constitutes the surface composite. These ultrafine grained structures are composed of theα-Alandα-Alamorphous structures.

Keywords: Friction stir processing; aluminium alloys; surface composite; microstructure (search for similar items in EconPapers)
Date: 2011
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DOI: 10.1142/S0218625X1101462X

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